Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Accumulated other comprehensive (loss) income, Beginning Balance	$ 120,953	$ (18,946)
Other comprehensive income (loss)	11,941	151,840
Accumulated other comprehensive (loss) income, Ending Balance	132,894	132,894
Unrealized gain (loss) on securities available for sale [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	168,221	19,432
Other comprehensive income (loss)	20,349	169,138
Accumulated other comprehensive (loss) income, Ending Balance	188,570	188,570
Pro-rata share of non consolidated subsidiaries' OCI [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	7,666	11,313
Other comprehensive income (loss)	(19,707)	(23,354)
Accumulated other comprehensive (loss) income, Ending Balance	(12,041)	(12,041)
Change in value of interest rate Swap [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(47,542)	(50,065)
Other comprehensive income (loss)	12,037	14,560
Accumulated other comprehensive (loss) income, Ending Balance	(35,505)	(35,505)
Other [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(7,392)	374
Other comprehensive income (loss)	(738)	(8,504)
Accumulated other comprehensive (loss) income, Ending Balance	$ (8,130)	$ (8,130)